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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | $ 2,119,439 | $ 1,607,571 | $ 1,808,562 | $ 1,605,492 |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  |  |  | $ 2,196
Net income | 223,787 | 195,816 | 622,402 | 565,039 |
Purchase of common stock for treasury | (61,063) | (173,831) | (365,542) | (657,369) |
Equity-based compensation | 20,770 | 23,586 | 58,680 | 51,690 |
Proceeds from Options exercised | 68,524 | 29,174 | 247,355 | 115,268 |
Ending Balance | 2,371,457 | 1,682,316 | 2,371,457 | 1,682,316 |
Common Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | 206 | 206 | 206 | 206 |
Ending Balance | 206 | 206 | 206 | 206 |
Additional Paid-In-Capital [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | 1,962,156 | 1,721,696 | 1,820,223 | 1,644,197 |
Equity-based compensation | 20,770 | 23,586 | 58,680 | 51,690 |
Proceeds from Options exercised | 68,524 | 29,174 | 247,355 | 115,268 |
Treasury stock issued upon option exercise and restricted share vesting | (31,270) | (12,133) | (106,078) | (48,832) |
Ending Balance | 2,020,180 | 1,762,323 | 2,020,180 | 1,762,323 |
Retained Earnings [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | 7,429,948 | 6,603,359 | 7,031,333 | 6,231,940 |
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax |  |  |  |  | $ 2,196
Net income | 223,787 | 195,816 | 622,402 | 565,039 |
Ending Balance | 7,653,735 | 6,799,175 | 7,653,735 | 6,799,175 |
Treasury Stock [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | (7,272,871) | (6,717,690) | (7,043,200) | (6,270,851) |
Purchase of common stock for treasury | (61,063) | (173,831) | (365,542) | (657,369) |
Treasury stock issued upon option exercise and restricted share vesting | 31,270 | 12,133 | 106,078 | 48,832 |
Ending Balance | (7,302,664) | (6,879,388) | (7,302,664) | (6,879,388) |
Deferred Compensation Trust [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | (16,912) | (17,148) | (16,937) | (17,383) |
Deferred compensation activity, net | 0 | 220 | 25 | 455 |
Ending Balance | (16,912) | (16,928) | (16,912) | (16,928) |
Deferred Compensation Liability [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | 16,912 | 17,148 | 16,937 | 17,383 |
Deferred compensation activity, net | 0 | (220) | (25) | (455) |
Ending Balance | $ 16,912 | $ 16,928 | $ 16,912 | $ 16,928 |

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